Automatic weighing-scale.



No. 643,423. Patented Feb. l3, I900.

. N. NILSUN.

AUTOMATIC WEIGHING SCALE.

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AUTOMATIC WEIGHING SCALE.

I (Application filed Nov. 8, 1897.)

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Patented Feb. l3, I900. N. NILSON.

AUTOMATIC WEIGHING SCALE.

(Application filed Nov. 8, 1897.)

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(No Model.)

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No. 643,423. A Patented Fab. I3, I900.

u. NILSON.

AUTOMATIC WEIGHING SCALE.

(Application filed. Nov. 8, 1897.) (N M m 4 Shaets-Sheet 4.

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UNITED STATES PATENT OFFICE.

NILS NILSON, OF MINNEAPOLIS, MINNESOTA.

AUTOMATIC WElGHlNG-SCALE.

SPECIFICATION forming part of Letters Patent No. 643,423, dated February 13, 1900.

Application filed November 8, 1897- ri 7,727: (N m l- To all whom it may concern:

Be it known that I, NILS NILsoN, of the city of Minneapolis, county of Hennepin, State of Minnesota; have invented certain new and useful Improvements in Automatic Weighing-Scal'es, of which the following is a specification.

My invention relates to automatic weighingscales; and the object of the invention is to provide an automatic weighing-scale in which friction, due to the sliding of one part upon another, is avoided, whereby perfect action is attained and accpracy insured.

A further object of the invention is to provide a weighing-scale of the rocker type and of a most simple, economical, and durable construction.

My invention consists in the combination of a lever whereon the weight of the object to be weighed exerts its force with a lever or bar to engage therewith, one of said parts be? ing a rocker, and means between or connecting said parts,whereby the longitudinal movement of one upon the other is prevented or controlled; and myinvention further consists in the combination, with a lever whereon the force is exerted, of a weighted lever, one of said parts having a curved bearing-surface and one thereof being longitudinally movable and having a fulcrum adapted to permit such longitudinal movement.

My invention further consists in various other constructions and combinations of parts, all as hereinafter described, and particularly pointed out in the claims.

The invention will be more readily understood by reference to the accompanying drawings, forming part of this specification, and in which Figure 1 illustrates an automatic scale embodying my invention. Fig. 2 is a vertical section thereof. Fig. 3 is a plan view of the operating parts of the automatic scale. Fig. 4 is a view similar to Fig. 2, showing a modified form of the construction of the lovers and also illustrating an auxiliary scale-beam. Fig. 5 illustrates the employment of a tape or hand between the two levers in place of the racks illustrated in Figs. 2 and 3. Fig. 6 is a plan view of the tape or band shown in Fig. 5. Fig. 7 is an enlarged cross-section substantially on the line 00 a: of Fig. 2 and on the line y y of Fig. 4. Fig. 8 is a similar cross section on the line a a of Fig. 5.

In the drawings I have illustrated a counfer-scale; but my invention is equally adapted for employment in connection with platform or other types of scales.

Referring to Fig. 1, 2 represents a circular dial, the graduations 3 of which are substantially regular and equally distant.

4 is a pointer, which is arranged upon a shaft 5.

6 is the plate or platform adapted to receive the object to be weighed.

The working parts of the scale are inclosed in a cylindrical case 7, which case is provided with a side projection 8. Within the case are the frame parts 9 9, which are connected by suitable ties or bolts 10 to make a rigid frame, wherein the various levers are pivoted and supported. The frame parts are separated by a suitable space, and the levers are met erably arranged between them. The parts 9 are preferably provided with upwardly-projecting arms or standards 11 and with horizontal extensions 12. The shaft 5 for the pointer 4 has bearings in the opposite sides of the frame. The platform or plate 6 may be arranged upon a stud 13 on the top bar 14 of the vertical yoke 15. The yoke 15 is connected with the frame by means of one or more links 16, extending between the upper part of the yoke and the standards 11 of the frame. vented by these links as well as by the pivotal connection of the lower end of the yoke to the rocker-beam 17 of the scale. The beam 17 is provided with transversely-extending knife-edges 18, provided with bearings in opposite sides of the frame. 'The lower edges of the knife-bearings are preferably on alevel with the shaft 5. The rocker-beam 17 is provided with an upwardly-extending arm 17', upon which is a block 19, provided with knifeedges 20, resting in holes 21 in the lower ends of the yoke 15. The knife-edges which form the pivotal connection between the platform-yoke and the beam 17 are vertically adjustable upon the arm 17, being secured thereto by a screw 22, which passes through a slot in the block 19. The knife-edges normally stand some distance above the pivots or fulcrums 18 in order that there may be as little varia- Lateral motion of the yoke is pre tion as possible in the leverage of the platform upon the beam 17 at the various points reached in the depression of the arm 17. The other arm or end 17" of the beam 17 has a curved upper surface forming a rocker where on the weight-lever 24 rests. The weightlever carries the weight 25, preferably adj ustable thereon, and the end of the lever is pivotally attached to the outer end of the arms 12 of the frame by means of a link or links 26. A block 27 is provided on the end of the lever 24 and is adjustable thereon, being secured by its screw 28 after it is adjusted. The fulcrums or pivots of the links 26 are knife-edges 29 30, arranged upon the block 27 and the arm 12. By means of this link the lever 24 is permitted free longitudinal movement, while at the same time a delicate fulcrum for the lever is obtained. The bar or lever 24 is provided with a plain under surface 31, while the lever or beam 17 is provided with a V edge 32, extending longitudinally upon its upper edge and whereon the beam 24 rests. If desired, the plane and V surfaces may be reversed on the levers 17 and 24. By means of the V-surface or raised edge the bearing of the beams 17 and 24 is reduced to a minimum. The movement of the weighted beam 24 is communicated to the dial-pointer through the medium of the rack 33 and the pinion 34. The pinion is secured on the shaft 5, and the rack 33 has its upper end pivoted upon the lever 24, and the rack is held in engagementwith the pinion bya light spring 33'. The lever is provided with the arch 35 to make room for the upwardly-projecting arms 17 of the rocker-beam 17. A bracing-link 36 prevents sidewise movement of the beam or lever 24,being pivoted thereon and connected to the standards 11 by short links 37, which allow the free movement of the bar 24. When a weight is placed upon the platform 6, the same is depressed and the arm 17 of the beam 17 is elevated, rolling upward beneath the lever 24 and raising said lever. As the beam rolls or rocks, the working length of the arm 17 is increased and the leverage of the weighted bar is shortened to bring about a balance between the object and the weighted lever. The upward movement of the bar 24 is communicated to the pointer through the pinion 34 and the rack 33, and the pointer will indicate upon the dial the weight of the object. When the bar or lever 24 is thus elevated, it is inclined and has a tendency to slip or slide upon the rocker-beam. To prevent any such movement which would at once render the scale inaccurate, I provide the beam 17 and the beam 24 with gear-racks 38 and 39, which mesh together and prevent longitudinal movement between the said bars or beams. The beam 24 is thus compelled to follow accurately upon the rocker-beam and is permitted to do so by the pivotal link that is employed to fulcrum the end of the bar or beam 24. The curve of the lever 17, the

relative lengths of the levers, and the kinds of pivots or fulcrums may be changed and modified to suit various conditions and constructions. 'Further, the particular forms of the levers may be altered; but so long as the upper bar is so pivoted as to allow its free movement in a longitudinal direction and is prevented from slipping or tipping upon the lower beam the device will operate accurately, reliably, and regularly.

A modified form of the scale is shown in Fig. 4, both bars being curved or being rockers, whereby a more regular movement of the hand may be obtained.

In Fig. 4 I have shown the substitution of a strap connection between the beam 17 and the platform-yokein place of the knife-edges shown in Fig. 2. This strap 40 is attached to the yoke 15 at its lower end and its upper end is adjus'tablysecured upon the beam 17. In this case the arm 17 is made in the arc of a circle having the fulcrum of'the beam 17 as a center. I have also shown in Fig. 4 the manner in which an auxiliary scale-beam 42 may be employed in connection with my scale. This beam is suitably pivoted upon the intermediate fulcrum and also in the lower end of the platform-yoke 15, which is extended for the purpose. The beam 42 is provided with a counterpoise 43, and the weight indicated upon the beam added to that indicated upon the dial of the scale gives the total weight of the object on the platform. In place of the intermeshing racks upon the rocker-beams I may make use of a simple metal tape or band 44, as shown in Figs. 5, 6, and 8. This band is secured to the upper lever and is provided with a slot 45 to accommodate the V edge upon the lower lever or beam, upon which lever its other end is secured. This band or tape will elfectually prevent longitudinal or sliding movement of the levers upon one another and is a good substitute for if not to be preferred to the racks. Either one of two cords may be used in place of the slotted band.

Obviously various modifications of my invention will be readily suggested to those skilled in the art by the foregoing description and accompanying drawings, and I do not confine my invention to the specific constructions herein shown and described.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. In an automatic scale, the engaging levers rocking one upon the other and having relatively-movable fulcrums or pivots, substantially as described.

2. In an automatic scale, the rolling contact-levers rocking one upon the other, in combination with relatively movable fulcrums therefor, and means controlling the relative longitudinal movement of said levers, substantially as described.

3. In an automatic scale, the combination, of the levers rocking one upon the other, with ICC weight and platform connections therefor, and relatively-movable fulcrums for said le- Vers, substantially as described.

4. The combination, in an automatic scale, of the rolling contact levers or bars rocking one upon the other having relatively-movable fulcrums, and means connecting said levers or bars and preventing relative longitudinal movement thereof, substantially as described.

5. The combination, in an automatic scale,

of engaging rocking bars or levers rocking one upon the other, said levers having relativelymovable fulcrums and one thereof adapted to longitudinal movement, and means connecting said bars or levers and controlling the relative longitudinal movement thereof, substantially as described. 6. The combination, with rolling contactlevers rocking one upon the other and having relatively-movable fulcrums, of engaging parts upon said levers to control their relative longitudinal movement, substantially as described.

7. The combination, with the rolling contact-levers rocking one upon the other and having relatively-movable fulcrums, of the racks arranged thereon and engaged to control the relations of said levers, substantially as described.

8. The combination, in an automatic scale, of the rolling contact-levers rocking one upon the other, and one adapted to longitudinal movement, with pivotal supports for said levers or bars, and means for controlling the relative longitudinal movement of said bars or levers, substantially as described.

9. The combination, with the rolling contact-levers rocking one upon the other and having relatively-movable fulcrums,of means supporting the same, and a V or edge upon one of said levers and wherewith the other, lever engages, substantially as described.

10. The combination, of the rocking or rolling contact levers or bars rocking one upon the other and having relatively-movable fulcrums, one having a plane surface and the other having a V rib or edge, with means controlling the relative longitudinal positions of said levers or bars, substantially as described.

11. The combination,with a curved rockerbeam, of a second lever or beam and rocking thereon, and a pivotal link whereby one of said levers is fulcru med, substantially as described.

12. The combination,with the rockerbeam, of the other beam and rocking thereon, said parts being pivotally supported or held, one by a stationary pivot and the other by a pivotal link, and means to control the relative longitudinal movement of said beams, substantially as described.

13. The combination, with the platform, of the curved rocker-beam, through which the force of the object to be weighed is exerted, a second lever or beam resting upon said rockerbeam and having its free end weighted, a link whereby the second lever is fulcrumed, and means to prevent the slipping of said second lever upon the first lever, substantially as described.

la. The combination,of a Weighted rocking lever, of a link whereby the same is fulcrumed and is permitted free longitudinal movement, with a second lever in rolling contact with the first lever and supporting the same, engaging racks upon said levers, and means for exerting upon the second lever the weight of the object to be measured or weighed, substantially as described.

15. The combination, of the levers in rolling contact, rocking one edge upon the other, with a link having a fixed pivot and also having the fulcrum of one of said levers, substantially as described.

16. The combination,with a suitable frame, of the rolling contact-levers rocking one upon the other and having relatively-movable fulcrums in or upon said frame, means for exerting force upon one of said levers to move or lift the other, a dial, a pointer, a pinion, connected with said pointer, and a rack carried by the lever which is lifted or moved and adapted to actuate said pinion, and pointer, substantially as described.

17. The combination,with a suitable frame, of a rocker-lever intermediately fulcrumed in said frame, a second lever having a fulcrum in said frame whereby it is permitted longitudinal movement in the frame, a Weight upon the second lever, a platform connected with the first lever, and an auxiliary scale-beam connected with said platform, substantially as described.

18. The combination, in an automatic scale, of the rolling contact-levers, rocking one upon the other and having relatively-movable ful crums, with the racks provided upon said 1evers and controlling the relative longitudinal positions thereof, one of said levers having a V edge in engagement therewith, and suitable indicator and platform connections, substantially as described.

19. The combination, in an automatic scale, of the rolling contact-levers, rocking one upon the other and having relatively-movable fulcrums,with a scale or platform in connection with one of said levers, a stationary frame, and the double link connection between the free lever and said frame, comprising the spreading link 36 and the vertical link or yoke 87, substantially as described.

In testimony whereof I have hereunto set my hand this 26th day of October, A. D. 1897.

NILS NILSON.

In presence of- O. G. HAWLEY, G. TITSWORTH. 

